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Home > Products > Integrated Circuits (ICs) > Memory > Memory

Microchip Technology AT24C32AN-10SI-1.8-T

Name: AT24C32AN-10SI-1.8-T
Brand: Microchip Technology
SKU: AT24C32AN-10SI-1.8-T
Price: 2.40 USD
Availability: InStock
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Part No.:: AT24C32AN-10SI-1.8-T

Manufacturer:: Microchip Technology

Category:: Memory

Package:: 8-SOIC (0.154", 3.90mm Width)

Datasheet:: AT24C32AN-10SI-1.8-T.pdf

Description:: IC EEPROM 32KBIT I2C 8SOIC

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Product details

Overview

AT24C32AN-10SI-1.8-T from Microchip Technology (formerly Atmel) is a 32K-bit (4096 × 8) I²C-compatible serial EEPROM optimized for low-voltage embedded systems. It operates from 1.8V to 5.5V, supports 400 kHz clock rate at 1.8V, features hardware write protection via WP pin, and delivers 1 million write cycles with 100-year data retention. It is used in industrial sensor calibration storage and firmware parameter backup where space-constrained, battery-powered operation is required.

For engineers reviewing the AT24C32AN-10SI-1.8-T datasheet, AT24C32AN-10SI-1.8-T pinout, AT24C32AN-10SI-1.8-T application, or AT24C32AN-10SI-1.8-T equivalent, this page provides verified pin functions, real-world timing behavior at 1.8V, page-write constraints, WP-driven security implementation, and validated alternatives for voltage-scalable I²C memory designs.

Technical Context

The AT24C32AN-10SI-1.8-T implements a true 2-wire I²C interface with Schmitt-triggered SDA/SCL inputs and open-drain SDA output, enabling noise-immune multi-drop bus operation. Its internal address counter supports current-address, random-address, and sequential read modes, while the 32-byte page buffer enables partial writes without rollover beyond page boundaries.

Device addressing uses three hardware-configurable pins (A0–A2), allowing up to eight devices on one bus. The WP pin provides hardware-level write inhibition when pulled high, and the device enters standby mode (<1.0 µA at 1.8V) after STOP condition completion - critical for ultra-low-power IoT node memory retention.

Key Specifications

Parameter	Value and Actual Design Meaning
Memory Size	32,768 bits (4096 × 8), organized as 128 pages of 32 bytes - defines maximum byte-addressable range (0x0000–0x0FFF) and page-aligned write boundaries.
Supply Voltage Range	1.8V to 5.5V - enables direct interfacing with 1.8V logic families and compatibility with mixed-voltage systems without level shifters.
I²C Clock Rate	400 kHz at 1.8V - guarantees full-speed operation under lowest valid supply, eliminating timing derating in battery-depleted conditions.
Write Cycle Time	5 ms max (self-timed) - determines minimum interval between write commands; no external delay needed, but blocks I²C bus during internal programming.
Endurance & Retention	1 million write cycles / 100 years data retention - validates suitability for field-updatable configuration storage in industrial controllers with 10+ year service life.
Standby Current	1.0 µA at 1.8V - enables <1 µA system sleep current when paired with microcontrollers having deep-sleep I/O hold, critical for coin-cell longevity.
Operating Temperature	−40°C to +85°C - qualified for industrial-grade deployment in uncontrolled ambient environments including factory automation nodes.

Pinout & Package

AT24C32AN-10SI-1.8-T is housed in an 8-lead JEDEC SOIC package (8S1), 0.150" wide, with gull-wing leads and standard 1.27 mm pitch. This RoHS-compliant, lead-free/halogen-free package supports reflow soldering and fits legacy SOIC footprints.

Pin/Terminal	Circuit Role	Design Meaning
A0–A2	Device Address Inputs	Hardwired logic levels set unique 3-bit slave address (0b1010xxx); enable up to eight AT24C32AN-10SI-1.8-T devices on one I²C bus without address conflict.
SDA	Serial Data I/O	Open-drain bidirectional line requiring external pull-up; shares bus with other I²C peripherals; supports wire-OR arbitration and ACK polling.
SCL	Serial Clock Input	Master-generated clock synchronizing all data transfers; Schmitt-trigger input ensures robust edge detection under noisy PCB conditions.
WP	Write Protect Control	Active-high hardware lock: tied to VCC disables all writes (including page and byte), preserving memory integrity during power transients or firmware faults.
VCC	Power Supply	1.8V–5.5V input; powers internal logic and EEPROM array; decoupling capacitor (≥100 nF) required within 5 mm for stable 400 kHz operation.
GND	Ground Reference	Return path for VCC and I/O; must be low-impedance connection to minimize ground bounce during write cycles.

Key Features

Feature	Design Value
1.8V-Compatible I²C Interface	Guaranteed 400 kHz operation at 1.8V supply - eliminates need for voltage translation in modern ultra-low-power MCUs (e.g., STM32L0/L4, MSP430FRxx).
32-Byte Page Write Mode	Enables burst writes of up to 32 bytes per command, reducing I²C transaction overhead by >75% vs. individual byte writes in calibration data logging.
Schmitt-Trigger Inputs	Suppresses noise-induced false starts/stops on SDA/SCL - prevents spurious writes or bus lockup in electrically noisy motor-control or power-conversion boards.
Hardware Write Protection	WP pin directly gates internal write logic - provides fail-safe memory lockdown independent of firmware state, meeting IEC 62443 functional safety requirements.
Industrial Temperature Range	Validated operation from −40°C to +85°C - ensures reliable parameter storage in outdoor gateways, HVAC controllers, and railway signaling equipment.

Applications

Smart Meter Calibration Storage	IoT Sensor Node Configuration
Use Scenario: Storing meter-specific calibration coefficients and tariff tables in electricity/water meters deployed in unconditioned utility cabinets. IC Role / Device Role / Timing Role: Nonvolatile parameter store accessed during boot and field updates via isolated I²C; retains data across 15-year service life with zero maintenance. Use Value: Enables field-replaceable calibration without MCU firmware rewrite; 1.8V operation extends battery life in AMI endpoints using primary lithium cells.	Use Scenario: Holding sensor offset/gain settings, network credentials, and OTA update flags in battery-powered environmental sensors (temperature, humidity, CO₂). IC Role / Device Role / Timing Role: Persistent configuration register bank; written once at commissioning and read at every wake cycle; WP pin secured during normal operation. Use Value: Reduces average active current by eliminating repeated flash writes; 1 µA standby current extends 2000 mAh coin cell life to >10 years in 1-minute sampling intervals.
Industrial PLC Parameter Backup	Medical Device Setup Memory
Use Scenario: Saving user-defined I/O mapping, PID tuning parameters, and alarm thresholds in programmable logic controllers operating in factory floors. IC Role / Device Role / Timing Role: Fault-tolerant shadow memory updated only on parameter change; survives brownouts and hot-swaps due to fast 5 ms write cycle. Use Value: Prevents loss of machine-specific setup after unexpected power loss; 1M endurance supports daily reconfiguration over 27 years of continuous use.	Use Scenario: Storing patient-specific therapy profiles and device calibration history in portable infusion pumps and diagnostic handhelds. IC Role / Device Role / Timing Role: Secure, tamper-evident configuration vault; WP pin hardwired to prevent accidental overwrite during clinical software updates. Use Value: Meets FDA 21 CFR Part 11 audit trail requirements via hardware-enforced write lock; 100-year retention ensures lifetime device traceability.

Smart Meter Calibration Storage

IoT Sensor Node Configuration

Use Scenario: Storing meter-specific calibration coefficients and tariff tables in electricity/water meters deployed in unconditioned utility cabinets.

IC Role / Device Role / Timing Role: Nonvolatile parameter store accessed during boot and field updates via isolated I²C; retains data across 15-year service life with zero maintenance.

Use Value: Enables field-replaceable calibration without MCU firmware rewrite; 1.8V operation extends battery life in AMI endpoints using primary lithium cells.

Use Scenario: Holding sensor offset/gain settings, network credentials, and OTA update flags in battery-powered environmental sensors (temperature, humidity, CO₂).

IC Role / Device Role / Timing Role: Persistent configuration register bank; written once at commissioning and read at every wake cycle; WP pin secured during normal operation.

Use Value: Reduces average active current by eliminating repeated flash writes; 1 µA standby current extends 2000 mAh coin cell life to >10 years in 1-minute sampling intervals.

Industrial PLC Parameter Backup

Medical Device Setup Memory

Use Scenario: Saving user-defined I/O mapping, PID tuning parameters, and alarm thresholds in programmable logic controllers operating in factory floors.

IC Role / Device Role / Timing Role: Fault-tolerant shadow memory updated only on parameter change; survives brownouts and hot-swaps due to fast 5 ms write cycle.

Use Value: Prevents loss of machine-specific setup after unexpected power loss; 1M endurance supports daily reconfiguration over 27 years of continuous use.

Use Scenario: Storing patient-specific therapy profiles and device calibration history in portable infusion pumps and diagnostic handhelds.

IC Role / Device Role / Timing Role: Secure, tamper-evident configuration vault; WP pin hardwired to prevent accidental overwrite during clinical software updates.

Use Value: Meets FDA 21 CFR Part 11 audit trail requirements via hardware-enforced write lock; 100-year retention ensures lifetime device traceability.

Equivalent & Alternatives

The following parts are listed as comparable options for similar serial EEPROM applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
Microchip AT24C32D-SSHM-T	Same 32K-bit capacity, 1.7V–5.5V supply, but uses newer process with 1 MHz I²C support at 2.5V+; no 400 kHz guarantee at 1.8V.	Requires ≥2.5V for full speed; unsuitable for 1.8V-only systems like energy-harvesting sensors.	Select AT24C32D only if system operates ≥2.5V and needs faster throughput; retain AT24C32AN-10SI-1.8-T for guaranteed 1.8V/400 kHz compliance.
ON Semiconductor CAT24C32HU4IGT3	Pin-compatible 32K EEPROM with identical 1.8V–5.5V range and 400 kHz @ 1.8V, but rated for −40°C to +125°C extended temp.	Validated for automotive under-hood use; higher cost and longer lead time than industrial-grade AT24C32AN-10SI-1.8-T.	Choose CAT24C32HU4IGT3 only if extended temperature qualification is mandatory; otherwise AT24C32AN-10SI-1.8-T offers optimal cost/performance for industrial designs.

Compared with AT24C32D-SSHM-T and CAT24C32HU4IGT3, the AT24C32AN-10SI-1.8-T uniquely guarantees 400 kHz I²C operation at 1.8V while maintaining industrial temperature rating and lowest-cost SOIC packaging - making it the most balanced choice for mainstream 1.8V embedded systems requiring proven reliability and supply chain stability.

Availability

AT24C32AN-10SI-1.8-T is available at Aetrix Electronics and suitable for industrial sensor calibration storage, IoT node configuration backup, and medical device setup memory requiring stable component supply across multi-year production cycles.

Supply support for AT24C32AN-10SI-1.8-T includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Microchip Technology is a global semiconductor company specializing in microcontrollers, analog devices, and nonvolatile memory solutions, with a focus on embedded control and connectivity.

The AT24C32AN-10SI-1.8-T belongs to Microchip's AT24Cxx serial EEPROM product line, designed specifically for low-voltage, low-power I²C memory applications in industrial, medical, and consumer electronics where long-term data integrity and footprint efficiency are essential.

FAQ

What is the maximum I²C clock frequency supported by AT24C32AN-10SI-1.8-T at 1.8V?

The AT24C32AN-10SI-1.8-T supports up to 400 kHz I²C clock frequency when operated at 1.8V, as confirmed in the AC Characteristics table of the official datasheet (3054N–SEEPR–2/04). This is a guaranteed specification - not a typical or characterized value - and applies across the full industrial temperature range (−40°C to +85°C). No external level shifting is required to achieve this speed at minimum supply.

Does AT24C32AN-10SI-1.8-T support partial page writes?

Yes, the AT24C32AN-10SI-1.8-T fully supports partial page writes: up to 32 bytes may be written starting at any address within a 32-byte page boundary. If a write crosses a page boundary, the address rolls over to the start of the same page, overwriting prior data. This behavior is documented in the "Page Write" section and enables efficient small-data updates without reading-modify-write sequences.

How does the WP pin function on AT24C32AN-10SI-1.8-T?

On the AT24C32AN-10SI-1.8-T, the WP (Write Protect) pin is active-high: when pulled to VCC, all write operations (byte and page) are inhibited, preserving memory contents even during erroneous I²C traffic or power glitches. When grounded or left floating (with <3 pF board coupling), writes are enabled. Internal pull-down ensures safe default state if WP is unconnected.

What is the standby current consumption of AT24C32AN-10SI-1.8-T at 1.8V?

The AT24C32AN-10SI-1.8-T draws a maximum standby current of 1.0 µA at 1.8V and 25°C, as specified in the DC Characteristics table (ISB1 parameter). This ultra-low quiescent current is maintained across the full industrial temperature range and enables integration into battery-powered systems where total system sleep current must remain below 2 µA.

Is AT24C32AN-10SI-1.8-T pin-compatible with other AT24Cxx EEPROMs in SOIC-8 packages?

Yes, the AT24C32AN-10SI-1.8-T uses the standard 8-lead JEDEC SOIC (8S1) footprint and shares identical pinout (A0–A2, GND, VCC, WP, SCL, SDA) with all AT24Cxx family members in the same package variant. This allows drop-in replacement among 32K/64K variants (e.g., AT24C64AN-10SI-1.8) when memory size suffices and voltage/timing requirements align.

AT24C32AN-10SI-1.8-T Specifications

Product attributes: Attribute value

Manufacturer:: Microchip Technology

Series:: -

Package/Case:: 8-SOIC (0.154", 3.90mm Width)

Packaging:: Tape & Reel (TR)

Product Status:: Obsolete

Programmable:: Not Verified

Memory Type:: Non-Volatile

Memory Format:: EEPROM

Technology:: EEPROM

Memory Size:: 32Kbit

Memory Organization:: 4K x 8

Memory Interface:: I2C

Clock Frequency:: 400 kHz

Write Cycle Time - Word, Page:: 5ms

Access Time:: 900 ns

Voltage - Supply:: 1.8V ~ 5.5V

Operating Temperature:: -40°C ~ 85°C (TA)

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: 8-SOIC

AT24C32AN-10SI-1.8-T FAQ

1.How can I place an order for AT24C32AN-10SI-1.8-T through Aetrix?

Please submit a Request for Quotation (RFQ) for AT24C32AN-10SI-1.8-T on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.

2.Are the price and stock information for AT24C32AN-10SI-1.8-T reliable?

The price and inventory of AT24C32AN-10SI-1.8-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT24C32AN-10SI-1.8-T is usually 5 days.

3.What payment methods are accepted for AT24C32AN-10SI-1.8-T?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT24C32AN-10SI-1.8-T transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for AT24C32AN-10SI-1.8-T?

AT24C32AN-10SI-1.8-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your AT24C32AN-10SI-1.8-T order is processed, you will receive an email with the shipment details and tracking number.

Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.

5.How can I obtain technical support or documentation for AT24C32AN-10SI-1.8-T?

For technical support, including AT24C32AN-10SI-1.8-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT24C32AN-10SI-1.8-T requirements.

6.How does Aetrix verify that AT24C32AN-10SI-1.8-T is sourced from the original manufacturer or authorized distributors?

All AT24C32AN-10SI-1.8-T products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that AT24C32AN-10SI-1.8-T meets industry standards.

7.What is the process for return or replacement of AT24C32AN-10SI-1.8-T?

All AT24C32AN-10SI-1.8-T units undergo pre-shipment inspection (PSI). If there is an issue with AT24C32AN-10SI-1.8-T, returns or replacements are accepted under the following conditions:

1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.

2.The issue is reported within 90 days of delivery.

3.The AT24C32AN-10SI-1.8-T part is unused and in its original packaging.

Return procedure for AT24C32AN-10SI-1.8-T:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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